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Wetlands have many functions that are beneficial. This module will discuss the following functions of wetlands: 1  wetlands filter harmful substances. 2  wetlands protect against floods. 3  wetlands protect against erosion.4  wetlands provide food and habitat.5  wetlands save people money.his module will discuss the following functions of wetlands: 1  wetlands filter harmful substances. 2  wetlands protect against floods. 3  wetlands protect against erosion. 4  wetlands provide food and habitat.
Wetland functions and ecosystem benefits. Wetland functions are defined as the physical, chemical, and biological processes or attributes that are vital to the integrity of the wetland system. Because wetlands are often transition zones (ecotones) between terrestrial and deepwater aquatic systems, many processes have major implications for species. Since wetlands may provide food and habitat for many terrestrial and many aquatic species, wetland biodiversity is often higher than that of adjacent ecosystems.